US1547487A - Balancing machine - Google Patents

Description

f 1,547,487 R. c. ALLEN BALANCING MACHINE Filed Feb, 28; 1921 July 28, 1525,

To diatom Patented July 2 8, 1925'.

BALANCING MACHINE.

it may concern: 1'

.Be it known that I, Ronnn'r G. ALLEN,

' a citizen of the United States, and a resident qbersf balanced are the unba to of and State of Pennsylvania, have invented a curate balancing, to make allowance for ment ofvthe end of abody adjacent to a fixed Esslngton, in the county of Delaware new and useful Improvement in Balancing achines, of which the following is a speci- -fication. r

My invention relates to balancing machines, particularlyof the combined static and dynamic type,xand it has for an object to provide a method and apparatus of this character which shall be capable of simple shall give accurate operation and which results.

As: heretofore constructed, balancing machines for placing bodies in running or dy' namic balance have required, in their operation, considerable calculation and cut-andtry operations or else an elaborate compensating mechanism; Accordingly, it is the purpose of my invention to avoid these objections by adesign of machine wherein the unbalanced condition of a rotor is indicated at one end at a time and appropriate corrections made to overcome the unbalanced condition. After one end is balanced, an adjustment of the machine is made for balancing the other end, and then the other end is balanced.

It'has been proposed to balance rotary bodies by havingvibratory supports or mem or each end of a body. Such vibratory members or supports are ordinarily provided with bearings for'the trunnions of a body; and, for convenience, rotors to be ance o ning's at each end. one vi ratory member is held while the other is free-to vibrate, and balancing operations arecarried on in connection with the free end, after which the free end is fixed and the formerly fixed end is freed for bal In operation,

. ancing. In view of the fact that the planes of the balance openings are spaced from the median lanes of the sup ortin bearings,

ance at the end 0 a body adjacent a fixed su port develops a moment which combines wit the moment at the produce a resultant which is the quantity actually observed. In order to it is, therefore,

the disturb' mg mosuppqrt inorder to ascertain the true extion, in which:

ordinarily provided with bal free end to,

effect acnecessary end of the body. If the body being balanced clude the axis of vibration, then the disturbing moment at that end would be zero and the observations at the other end would truly indicate the position and extent of unbalance. In accordance with my invention, therefore, I provide a vibratory member whose axis of vibration may be adjusted to coincide with either plane of correction so that corrections-may be made to compensate for unbalance at each end of a rotor wighout affecting the balance at the other en.

' Apparatus embodying features of my in vention is illustrated in the accompanying drawings, forming a part of this applica- 1g. 1 is a side elevation of a balancing machine incorporating my improvements;

Fig. 2 is an end elevation thereof; and Figs. 3 and 4 are detailed views of the lower face of the vibratory frame and the upper face of the base/plate, respectively. Referring to the drawings for a more detailed description of my invention, a balancing machine 9 is shown, upon which is mounted a rotary body 10 to be placed in static and dynamic balance. v

The machine comprises a base member 11,- preferably' of massive and rigid construction, to which isconnected a vibratory frame" 12 by suitable flexible means, for example, an I-beam 13, which has itsweb portion dis posed transversely or normally with res gect to the base member and the frame mem er. The vibratory frame 12 carries upon its upper face bearing pedestals 13 and 14 for the trunnions or journals balanced.

Adjustable spring connections are provided tween the vibratory frame and the rigid base member, there preferably being a connection for each end of the vibratory frame. Each adjustable connection comuses a spring 15 secured to the base memer' at its lower end and secured by means of a swivel 16 to, an adjustable screw 17 having a hand wheel 18 for manual opera tion; The screws are'mountedin brackets;

19 secured to the vibratory frame.

-1 j usting the screws,

the tension of the-springs J i may be varied, whereby they are capableof functioning to magnify the vibrations of the member being balancedthrough resonance.

The base member 11 is provided with machined grooves 20- and the vibratory frame has longitudinal slots 21. The I-beam connection 13 has appropriate openings for adjusting screws or bolts 22 fitting in the machined grooves 20 and for'adjusting screws or bolts 23 fitting in longitudinal slots 21. This construction permits of the adj ustment of the I-beam connection longitudii example, end planes of the journal nally of the vibratory frame, whereby it may be brought into the plane of a particular portion ofthe body to be balanced, for

correction.

The rotor 10 is provided with journals or trunnions adapted to be mounted on bearings carried by the pedestals 13 and 1s. As shown in Fig. 2, each of the bearings comprises pivoted shoes 25 which'cooperate with or trunnion portions'to form load-supporting wedge-shaped oil films. A

, tive arc of bearing,

deviations of the journal from its true theomature wise occur. In so far as wherein any appropriate bearing of this type has a high capacity for loads due to the uniform distribution of the load throughout the surface of the wedgeance. The armature shaft is connected to one .of the journals or trunnions of the rotor means of avflexible shaft 30 and an appropriate cou ling 31; Motor leads 32 are shown carrie by the *vibratory frame 12 and connected to the base member 11, the

portions thereof between the vibratory frameand the base member 11. being readily extensible whereby the vibrations of the vi- "bratory frame are not sensibly affected thereby.

An indicating device 35 ismounted on the base'member 11 and cooperates with the [vibratory frame to indicate vibrations as well as their magnitude.

' order to balance the body,

The rotor is rovided with an annular I series of'tapped oles 36 in 'e'ach'end, equidistantly spaced circumferentially, and into which threaded plugs may be inserted in although it will beobvious that'any mode of mod1fyin the distribution of mass might be adop nals by means of a anced in a be In other words,

shaft into static and dynamic bal-- therefore such limitations] shall The operation of apparatus incorporating my improvement is as follows: The ro'-- tary body 10 to be placed in static and dynamic balance has its journalor trunnion portions mounted in the bearings carried by the pedestals 13 and 14:. The armature shaft 27, which, with its armature, has been placed in static and dynamic balance, is

connected to one of the trunnions or jourin position with reference 'to the vibratory frame and base member with itsweb portion in the vertical plane of one seriesof tapped openings 36; whereupon the electric motor. is started and vibrations of the vibratory frame 12 in a vertical plane are observed on the indicator 35 when the revolutions per minute correspond to the number of natural- .vibrations per minute of the vibratory frame, that is, when the amplitude of the vibrations is a maximum.- are inserted in the openings 36 until the vibrations substantially cease, the size and location being determined by trial and error. The springs 15 may varied for'the purpose of properly leveling the vibratory frame and glving the springs adequate tension. After the right-hand end of the rotating body has attained a state of running balance, the I-beam connection is shifted relatively base member and secured in position with its web' portion in the plane of the righthand tapped openings 36 whereupon the flexible shaft and cou- 'pling. The adjustable I-beam 13 is secured Threaded plugs have their tension to the vibratory frame and body is rotated and the left-hand end balsimilar manner. From the foregoing, it will be seen that I have devised a balancing machine in which the operation of the balancing is divided. I balance one end of a rotary body and then balance the other, thereby eliminatin considerable calculation, cut-and-try operations or elaborate compensating mechanisms.

While I have shown an-I-beamconnection.

between the vibratory frame or member12 andthe base member or bed-plate 11, it will be obvious'to those skilled in the art; that any arrangement which will permit of.

the-vibratory membermoving about an axis falling wit in one of the correction planes may be used. I wish it to be understood,

this specification and the appended claims in abroad sense tofsignif'y any type of con' that the word flexible is used n i necti'on which will permlt of movement in the manner-stated. I a While I have shown my invention in but one form, it will be' obvious to those skilled in the art that it is not so limited but issusceptible of various other. changes and'modifications, without'departing fromthe spirit thereof and 'I desire, he'refore, that .onl

be placed thereupon as are imposed by the prior art or as are specifically set forth in the appendedclaims.

a flexible supporting What I claim is:

1. In a balancing machine, the combination of a base member, a vibratory frame adapted to support a rotary body to be placed in static and dynamic balance, and connection between the vibratory frame and the base member and adjustable relative thereto to be brought into the plane of one end of the rotary body While the other end is-being balanced.

2. A balancing'machine comprising a base member, a vibratory frame, bearings carried by the frame for a rotary member adapted to have end balancing portions to be baling the vibratory frame and the base memher and adjustable relatively to the frame and base member whereby/it may be brought into the vertical plane of one end balancing portion while the other end balancing portion is being balanced.

3. In a balancing machine, the combination of a vibratory member, a base member, bearings carried by the vibratory member for a member to be balanced, a motor carried by the vibratory member, means to balance the rotary element of the motor, a flexible shaft adapted to connect the motor and the member to be balanced, an I-beam for supporting the vibratory member on the base member and adjustable with reference to the base member and vibratory member so that 4 it may be brought into the plane of one endof the body to be balanced while the other end balancing portion is beingbalanced.

4. A balancing 'machine comprising a vibratory supporting member for a body to anced, a flexible supporting member connectsubscribed my be balanced, abase member, a flexible member disposed transversely of and base members, and means whereby the flexible member may be adjusted to different positions longitudinally of the vibratory supporting and base members.

5. In a balancing machine, the combination of a vibratory frame for supporting a body to be balanced which has endplanes of correction, a base member, and an I-beam connection between the vibratory frame and the base member and adjustable with respect thereto so that the Web portion of the I-beam may be placed'in the correction plane of an end of the body while the other end is being balanced. I

6. In a balancing machine, the combination of a vibratory frame, a base member, an I-beam member carried by the base member for supporting the frame, means for adjusting the I-beam member'in different positions with respect to the base member and the frame,-springs for connecting the frame to the base member, and means for varying the tension of the springs.

7. In a balancing machine, the combination of a vibratory member-,a base member,

an I-beam member carried by the base member for supportlng the means for adjusting the different positions with bratory member and the adjustable tension means of the member.

In testimony vibratory member, I-beam member to respect to the vibetween the ends vibratory member and the; base whereof, I have hereunto ruary, 1921.

ROBERT C. ALLEN.

name this 23rd day of Febthe supporting base member, and

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